I’ll be honest, I’m not really sure and I haven’t been able to find anything that makes me feel confident in any particular recommendation about particulate matter cutoffs, mask efficacy, etc. The European Lung Foundation hems and haws about this topic, but makes no recommendations…probably because they don’t feel confident either.
If it were me, I’d try to figure out a way to train inside. If that’s absolutely not possible. I’d probably try to lift outside with additional ventilation while wearing a mask for brief periods of time.
Thanks. I can’t possibly lift indoors, so I did my workout with a N95 mask on. It wasn’t that bad, in spite of the heat–far better than skipping a workout, at any rate.